Brennus

Brennus (448 BC-387 BC), born Bran, was a chieftain of the Senones who was responsible for the notorious Roman defeat at the Battle of the Allia in 390 BC and the sack of Rome in 387 BC. That same year, he was slain in battle by Marcus Furius Camillus, who retook Rome for the Roman Republic.

Biography
Bran was the chief of the Gallic Senones, whom he led over the Alps in 400 BC. The Senones invaded northern Italy, drove the Umbri from their homes, and settled in a portion of Italy stretching from Ariminum to Ancona; Brennus founded Sena Gallica (Senigallia) as the Senones' capital in Italy. In 391 BC, the Senones invaded Etruria and besieged Clusium, which appealed to the Roman Republic for support. At the Battle of the Allia in 390 BC, Brennus annihilated a Roman army, and his army proceeded to capture most of Rome in 387 BC, although the Capitoline Hill remained in Roman hands. The Romans attempted to buy their salvation from Brennus, but, during a dispute over the weights used to measure the Roman gold, Brennus threw his sword onto the scales and uttered the famous words Vae victis ("Woe to the conquered!"), meaning that the conquered should not expect leniency. The argument had so delayed matters that the exiled dictator Marcus Furius Camillus had extra time to muster an army, return to Rome, expel the Gauls, and save the treasury. The Gauls were routed from the city and defeated in battle eight miles on the road to Gabbi, and Brennus and many of his warriors were slain, avenging the atrocities which they had committed in Rome.